The Mercedes-AMG A45 blew the hatch segment wide open when it was first launched a few years ago. With 265 kW the first-gen A45 was head and shoulders above any other turbocharged four-cylinder hatch on the market. Not keen to rest on their laurels the second-generation A45, launched last year, upped the game yet again with an output of 310 kW. Read more about the engine at this link. Now we have the Posaidon Mercedes-AMG A45 that takes things to another level.

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Power up

German tuning house Posaidon decided to give the AMG hyper hatch a working over to ramp up power. The company’s RS525 upgrade replaces the A45’s turbocharger with a new unit. To match the larger blower they revised the engine mapping, and software of the eight-speed dual-clutch transmission. Once all the revisions are made peak power rises to 386 kW (525 hp, hence the name) with a crazy (for a four-cylinder) 600 N.m of torque, for reference, a stock A45S produces 500 N.m. And Posaidon isn’t quite done yet. The company says an even more powerful ‘Plus’ tuning package is still in the pipeline.

Click here to read about the power output of the upcoming Mercedes-AMG GT Black Series.

Performance increase

Naturally, a 25 per cent bump in power comes with much better performance. The Posaidon Mercedes-AMG A45 is said to be able to reach a top speed of 324 km/h (201 mph in old money). The company also says the RS525 package shaves half a second of the car’s zero-100 km/h sprint. The new time is quoted as 3,4 seconds, versus 3,9 for the standard car.

Click here to check out images from a private Mercedes-Benz collection.

For those who aren’t as obsessed with such high power numbers there is a slightly less bonkers version. With a few software tweaks adjustments this model produces 342 kW and 560 N.m. Sprinting to 100 km/h takes 3,6 seconds with a top speed of 318 km/h.